For my bus, I've been hunting for a compressor for a while. Even though it had less power (for a passenger automobile), the regular one of the same brand managed, albeit not without effort. Pressure (front and back) ranges from 3.8 to 4.6. This beast has a swift blow. The only inconvenience is having to open the hood to access the engine's power (or a battery, whatever is more convenient for you). But if not, there won't be any such authority.
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